Free · Solana · graded by real prices
Prove your coin calls were right.
Say which coin will go up or down before it happens. Callstamp records your call with a free wallet signature, then grades it against the real price, A to F. Anyone can check the result, so nobody can fake a win with a screenshot.
Uses a free message signature from your Solana wallet, an optional on-chain timestamp, and Jupiter price history.
How it worksThree steps, like a scoreboard.
- 1
You call it
Pick a coin, say up or down, and set a target.
- 2
Your wallet signs
Free and instant. Callstamp notes the price at that moment.
- 3
You get graded
Real prices decide: A for target hit, F for badly wrong.
Signing a call is free and moves nothing. Only the optional on-chain stamp costs a tiny network fee, and only if you approve it in your wallet.
Make the call.
What this does: records your prediction for a coin, signed by your wallet so nobody can change it later.
Pick a token, say which way and how far, give your reason. Your wallet signs the exact text (a message signature: free, no transaction). Add an on-chain stamp if you want the time proven by Solana rather than by your word.
Preview of the signed text
Pick a token to see the exact message your wallet will sign.
The grade comes from the tape.
What this does: checks a call against the real price and gives it a grade from A to F.
Paste any Callstamp card, or open one from your book. The entry price is looked up independently on Jupiter’s 1-minute candles at the moment of the call, so a caller cannot flatter it. Then the move, the peak and the target are measured up to the horizon, or to now if it is still running.
Your book (this browser)
Calls you sign here are kept in this browser’s storage.
A graded call shows here: entry, exit, peak, target and the letter.
A caller’s track record.
What this does: adds up every call a wallet has made, so you can see if a caller is actually any good.
Enter a caller’s wallet. Callstamp finds every on-chain call stamp in its recent history (and any cards in your book from that address), grades each one against real candles, and adds up the record. Connect your wallet to see your own.
Check anyone’s receipt.
What this does: proves whether a shared call is genuine and unedited.
A screenshot proves nothing. Paste a signed card to check its Ed25519 signature against the caller’s public key, in your browser. Or paste a transaction signature to read a stamp straight from Solana: who signed it, in which block, and whether it matches a card.
The verdict, the signer and the exact signed text appear here.
Trending coins right now.
What this does: shows today’s busiest coins and how an “up” call on each would be doing.
Jupiter’s trending pools, with what a call made one, six and 24 hours ago would show today. Pick one to call it yourself. Refreshes every two minutes while you watch.
Scroll the tape. Watch a call age.
About six hours of a real trending coin, minute by minute.
How a call becomes a record.
- 1
Sign
Your wallet signs a plain-text message with the token, direction, target, horizon, thesis, quoted price and time. Signing a message costs nothing.
- 2
Stamp (optional)
An SPL Memo transaction writes the call’s SHA-256 hash and terms to mainnet. Now the time comes from a block, not from the caller.
- 3
Grade
Entry is read from Jupiter’s 1-minute candles at the call time. Exit, peak and drawdown are measured over the horizon, and a letter is given by fixed rules.
- 4
Verify
Anyone can check the Ed25519 signature in their own browser, or read the stamp from chain. No account, no server database, nothing to trust but maths.
The words, in plain English.
- Call
- A public prediction: this coin will go up (or down) by a set amount before a deadline.
- Target and horizon
- The target is how far you expect it to move; the horizon is the deadline.
- Call card
- Your call as a small block of text plus your wallet’s signature. Share it anywhere.
- Signature
- Proof from your wallet that you wrote this exact text. Free, and it moves nothing.
- Stamp (memo)
- An optional short note written to Solana. Its time is set by the network, so the call time cannot be faked.
- Mint / token address
- The address that identifies one specific coin. Names can be copied; addresses cannot.
- Grade
- A = target hit. B = right by 10% or more. C = flat. D = wrong by 10% or more. F = wrong by 50% or more.
- Candle
- The price summary for one minute (or hour): open, high, low and close. Grades use Jupiter’s.
Rules of the game.
What is this, in one sentence?
A free scoreboard for coin predictions: you sign a call with your wallet before the move, and real prices grade it later, so anyone can see who is actually right.
Is it safe? Does it touch my money?
Signing a call is a free message signature. It is not a transaction, and it cannot move your coins. The only transaction Callstamp can build is the optional stamp: a short memo that costs about 0.000005 SOL, shown on a review sheet first, and only sent if you approve it in your wallet. Nothing is ever sent to anyone, and nothing is wagered.
How is the letter grade decided?
Return is measured from the entry candle to the last candle inside the horizon, flipped for “down” calls. A = the target was reached at any point in the horizon. B = finished at least 10% right. C = within 10% either way. D = finished at least 10% wrong. F = 50% or more wrong. A call still inside its horizon is marked live.
Can a caller fake the time on a signed card?
On a card that is only signed, the time is the caller’s claim; the signature proves who wrote it, not when. A memo stamp fixes that: its block time is set by the network. Scorecards mark which calls are stamped.
Can they fake the entry price?
No. The card records the price the caller saw, but grading ignores it and reads the 1-minute candle at the call time from Jupiter. If the two differ a lot, the grader shows both.
Is this betting?
No. Nothing is wagered and nothing is paid out. A call is a signed statement; the grade is a measurement. Callstamp never moves your tokens.
What does the stamp transaction contain?
One SPL Memo instruction, signed by you, with a line such as callstamp:v1|m=<mint>|d=up|t=50|h=24h|p=0.0012|s=<hash>. The review sheet shows the exact text and the quoted fee first.
Where are my calls stored?
Signed cards live in your browser and wherever you paste them. Stamped calls also live on Solana. Callstamp has no server-side database of calls.